Xi2 Centauri

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ξ2 Centauri
Template:Location mark
Location of ξ2 Centauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Centaurus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.30[2] + 9.38[3]
Characteristics
Spectral type B1.5 V[4] or B2 IV[5] + F7 V[3]
U−B Template:Engvar −0.810[2]
B−V Template:Engvar −0.197[2]
Astrometry
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: −26.15[1] mas/yr
Dec.: −12.03[1] mas/yr
Parallax (π)6.98±0.24 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.51[7]
Orbit[8]
Period (P)7.6497 d
Eccentricity (e)0.35
Periastron epoch (T)2418077.493 JD
Argument of periastron (ω)
(secondary)		308.6°
Semi-amplitude (K1)
(primary)		38.8 km/s
Details
ξ2 Cen A
MassTemplate:Val[4] Template:Solar mass
Luminosity (bolometric)1,702[9] Template:Solar luminosity
Surface gravity (log g)Template:Val[9] cgs
TemperatureTemplate:Val[9] K
Rotational velocity (v sin i)25[10] km/s
AgeTemplate:Val[4] Myr
ξ2 Cen B
Mass1.25[9] Template:Solar mass
Luminosity2.4[9] Template:Solar luminosity
Temperature6,194[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
ξ2 Cen, CD−49°7644, FK5 489, HD 113791, HIP 64004, HR 4942, SAO 223909.[11]
Database references
SIMBADdata

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Xi2 Centauri, Latinized from ξ2 Centauri, is a triple star[12] system in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of 4.30,[2] and forms a wide optical double with the slightly dimmer ξ1 Centauri.[13] Based upon an annual parallax shift of 6.98 mas, Xi2 Centauri lies roughly 470 light years from the Sun. At that distance, the visual magnitude is diminished by an interstellar extinction factor of 0.32 due to intervening dust.[14]

This system was discovered to be a single-lined spectroscopic binary in 1910 by American astronomer Joseph Haines Moore.[15][16] The pair, component A, orbit each other with a period of 7.6497 days and an eccentricity of 0.35.[8] The primary is a B-type star with a stellar classification of B1.5 V[4] or B2 IV,[5] depending on the source. This indicates it may be a main sequence star or a more evolved subgiant star. It has about 8.1 times the mass of the Sun[4] and radiates 1,702 times the solar luminosity from its outer atmosphere at an effective temperature of 20,790 K.[9] It is a hybrid pulsator and shows spacings in both g and p modes.[17]

A third star, component B, is a magnitude 9.38 F-type main sequence star with a classification of F7 V. It has 1.25[9] times the mass of the Sun and radiates 2.4[9] times the solar luminosity at an effective temperature of 6,194[9] K. It lies at an angular separation of 25.1 arc seconds from the inner pair.[3] They share a common proper motion, indicating they may be gravitationally bound with an orbital period of around 41,000 years.[18]

The system has a peculiar velocity of Template:Val.[6] It belongs to the Scorpius–Centaurus association and appears to be a member of the Gould's Belt.[19]

References

Template:Reflist

External links

Template:Stars of Centaurus

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named apjs15_459
  3. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Gahm1983
  4. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Tetzlaff2011
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Hohle2010
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Bobylev2013
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Pourbaix2004
  9. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named Gerbaldi2001
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Wolff2007
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named FogCity2003
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2012
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Moore1910
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Meubauer1931
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Sharma
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Tokovinin2008
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Bobylev2007
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